I read lots of things. I will still go back and read Anne of Green Gables, the whole series. I own ALL the Terry Pratchett books, including the Johnny series - I have a real soft spot for the Johnny books, they're similar to the children in Good Omens (which is BRILLIANT).
Harry Potter is clearly aimed at children but there is enough in it to keep me entertained as well. I haven't left my childhood likes behind, they're still there, I just have other likes as well.
Recently I bought all the Eoin Colfer Artemis Fowl books as well - but I wouldn't bother with those if I were you, OP, they're also children's books.
I also like most of the animated films that come out these days - all the Pixars, many of the Disney and other studios (but NOT fucking Sponge Bob, that is shit).
I also read adult books too - and have done since I was a child - have read lots of different genres, don't really have a favourite genre as such, although there are some books I cba with now. Mostly nasty grisly ones, or psychological screw up ones (those that mess with my head, in other words).
One thing that I did notice about the HP books though, was that people I knew who tried to read them as young adults, like you, OP, just didn't cope well - they were trying to be adults, and the books were still too childish, so they didn't sit well in their new(ish) adult status, iyswim. Whereas older adults I knew, like me, really liked them. :)
But that's a gross generalisation and only works among the people I know - and as others have said, you don't have to like everything that everyone else does, it's a matter of personal taste.